blkcg: fix incorrect read/write sync/async stat accounting

While unifying how blkcg stats are collected, 77ea733884eb ("blkcg:
move io_service_bytes and io_serviced stats into blkcg_gq") incorrectly used bio->flags instead of bio->rw to tell the IO type. This made IOs to be accounted as the wrong type. Fix it.

Signed-off-by Tejun Heo <[email protected]>

Fixes 77ea733884eb ("blkcg: move io_service_bytes and io_serviced stats into blkcg_gq")

---
 include/linux/blk-cgroup.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

include/linux/blk-cgroup.h +2 -3

@@ -713,9 +713,9 @@ static inline bool blkcg_bio_issue_check
 
 	if (!throtl) {
 		blkg = blkg ?: q->root_blkg;
-		blkg_rwstat_add(&blkg->stat_bytes, bio->bi_flags,
+		blkg_rwstat_add(&blkg->stat_bytes, bio->bi_rw,
 				bio->bi_iter.bi_size);
-		blkg_rwstat_add(&blkg->stat_ios, bio->bi_flags, 1);
+		blkg_rwstat_add(&blkg->stat_ios, bio->bi_rw, 1);
 	}
 
 	rcu_read_unlock();
--

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